Search found 2245 matches

by Prime
Wed Apr 26, 2017 10:42 pm
Forum: wanted
Topic: Turtle LOGO for BBC Compact
Replies: 8
Views: 120

Re: Turtle LOGO for BBC Compact

Most USB floppy drives will only work with "IBM" PC MSDOS formats :( Or more correctly one that uses the same physical format as a PC type disk so : single or double sided 80 track 9x 512byte sectors (double density format) single or double sided 80 track 18x 512byte sectors (high density...
by Prime
Wed Apr 26, 2017 10:36 pm
Forum: software: other
Topic: Acornsoft Logo documentation
Replies: 14
Views: 824

Re: Acornsoft Logo documentation

Couple of questions...... There seem to be two versions of rom 1 : LOGO-1.rom and LOGO-1-1201388.rom but only one of rom2 : LOGO-2-1201387.rom, does it matter which version of ROM1 is used. To drive the Valliant turtle, do I need anything else to be loaded once I have made up a paralell cable? Or wi...
by Prime
Wed Apr 26, 2017 1:07 pm
Forum: hardware
Topic: Valiant turtle control module.
Replies: 15
Views: 189

Re: Valiant turtle control module.

Apparently you may also be able to read the code from the 8049s :

http://www.sbprojects.net/projects/8049spy/index.php

Should be possible to adapt to work with something like an AVR or PIC connected to a PC.

Cheers.

Phill.
by Prime
Tue Apr 25, 2017 10:12 am
Forum: off-topic
Topic: Domino DIN plugs
Replies: 2
Views: 110

Domino DIN plugs

Hi all,

Does anyone know where I can get a 'domino' style DIN plug (would need a couple), as used on the Beeb serial port, the usual suspects like Farnell & Rapid don't seem to stock them.

Cheers.

Phill.
by Prime
Mon Apr 24, 2017 5:14 pm
Forum: hardware
Topic: Valiant turtle control module.
Replies: 15
Views: 189

Re: Valiant turtle control module.

So I think either the schematic or the cable have the two connections reversed, which would explain why it doesn't work correctly Well, yes and no :) You are correct, the serial cable is incorrect (I just verified it against one of my communicators). This is a result of the amount of time I spent p...
by Prime
Mon Apr 24, 2017 2:43 pm
Forum: hardware
Topic: Valiant turtle control module.
Replies: 15
Views: 189

Re: Valiant turtle control module.

Humm I'm more and more doubting the cable layout, If I'm reading things correctly the cable is suggesting connecting the centre pin of the beeb serial port which is GND to pin 3 of the control box which is SERIAL_RTS, and an OUTPUT from a 1488 level shifter. This in itself does not seem like a smart...
by Prime
Mon Apr 24, 2017 9:33 am
Forum: hardware
Topic: Valiant turtle control module.
Replies: 15
Views: 189

Re: Valiant turtle control module.

I'll try to dig up the material you need this evening and post it here. The Eagle files shouldn't be a problem. Cheers, thanks. I guess (on the master) you have verified the serial settings to 2400 baud 8N1? It should work with 7N1 too according to my notes. They'll be what ever the Valiant softwar...
by Prime
Mon Apr 24, 2017 8:27 am
Forum: hardware
Topic: Valiant turtle control module.
Replies: 15
Views: 189

Re: Valiant turtle control module.

I also have an original parallel to BBC userport cable... so I'm pretty certain the pin out in the article is correct. I have a couple of control units too; so if you let me know what you think is incorrect I can check it. The redrawn schematic on my site is based on the schematic from the service ...
by Prime
Sun Apr 23, 2017 11:39 pm
Forum: hardware
Topic: Valiant turtle control module.
Replies: 15
Views: 189

Valiant turtle control module.

Hi all, I'm currently trying to repair the control module on a Valliant Turtle for use at the Cambrdige meetup. Just so I can check component values does anyone have one that works that they'd be prepared to open and check some resistor values for me. Yes I am aware of http://www.waitingforfriday.co...
by Prime
Fri Apr 21, 2017 7:13 pm
Forum: upcoming and recent events & exhibitions
Topic: Wakefield RISC OS show 22/4/17
Replies: 87
Views: 1977

Re: Wakefield RISC OS show 22/4/17

And I'm here and so is Daniel, just bumped into him checking in.

Cheers.

Phill.
by Prime
Fri Apr 21, 2017 5:46 pm
Forum: upcoming and recent events & exhibitions
Topic: Wakefield RISC OS show 22/4/17
Replies: 87
Views: 1977

Re: Wakefield RISC OS show 22/4/17

Sitting in Trowell services with Lesley drinking a bucket of costa coffee.

Hope to be there between 7 and 8.

Cheers.

Phill.
by Prime
Thu Apr 20, 2017 7:05 pm
Forum: upcoming and recent events & exhibitions
Topic: Wakefield RISC OS show 22/4/17
Replies: 87
Views: 1977

Re: Wakefield RISC OS show 22/4/17

I'm tempted to bring the latest DragonMMC board (and a Dragon) to show that off, but I did want to travel lighter, and have some of DaveM's stuff to return to him. Also as I'm also bringing Sinclair stuff to (hopefully) repair leenew's Spectrum, I don't want to bring any more non-Acorn stuff as it m...
by Prime
Thu Apr 20, 2017 2:46 pm
Forum: upcoming and recent events & exhibitions
Topic: Wakefield RISC OS show 22/4/17
Replies: 87
Views: 1977

Re: Wakefield RISC OS show 22/4/17

Does anyone coming to Wakefield have a UNI GoSDC that they can bring along, please? I'd like to compare it to the one I have that's 'playing-up' somewhat! Dave, Do you want to bring your Atom with you, I need to try and work out why it won't work in 1.7MHz mode and fit protection resistors to the t...
by Prime
Wed Apr 19, 2017 1:25 am
Forum: upcoming and recent events & exhibitions
Topic: Wakefield RISC OS show 22/4/17
Replies: 87
Views: 1977

Re: Wakefield RISC OS show 22/4/17

Would anybody who is attending the show happen to have any of the following spare parts they could bring along to help resurrect a dead speccy? These would be borrowed for an hour or so to help diagnose a fault. If they are available for sale I could purchase them on the day if it helps bring it ba...
by Prime
Sun Apr 16, 2017 3:06 pm
Forum: off-topic
Topic: screws.....
Replies: 4
Views: 154

screws.....

Hi all, Does anyone know where I can get some 3mm dia 7mm long self tapping screws ? All the usual sources B&Q, Screwfix seem to have screws that are either too long or too wide :( In case you where wondering these are the screws that the Dragon 32 / 64 use to hold the power and logic boards int...
by Prime
Wed Apr 12, 2017 9:02 am
Forum: upcoming and recent events & exhibitions
Topic: Wakefield RISC OS show 22/4/17
Replies: 87
Views: 1977

Re: Wakefield RISC OS show 22/4/17

Right I'll be there, Booked into the hotel on friday night so Lesley & I should be arriving sometime that evening depending on traffic. DaveM do you want me to bring the stuff from Bas, and your Olivetti, I could do with getting rid of it, I'll also build you an AtomSID if you want. Anything els...
by Prime
Wed Apr 12, 2017 8:50 am
Forum: hardware
Topic: Suspect ATMEL AT28C256 marked EEPROMs
Replies: 79
Views: 2163

Re: Suspect ATMEL AT28C256 marked EEPROMs

You know you can buy the genuine article from RS? http://uk.rs-online.com/web/p/eeprom-memory-chips/6963165/ < Ducks > :lol: Or Farnell, infact the money you "saved" on buying cheap knock-offs you've wasted in your time trying to get them to work. I've said it before and I'll say it again...
by Prime
Wed Apr 05, 2017 12:00 pm
Forum: hardware
Topic: MaxRAM - New Open Hardware BBC RAM/ROM Board
Replies: 68
Views: 1650

Re: New Open Hardware BBC RAM/ROM Board

Well I guess as you're choice of software is so superior to mine, I won't botheroffering to help again. And yes I'm a little pissed. Phill. What have I said? I have used Eagle in the past and use Kicad these days. Is it offensive to use open source software instead of proprietary software? Not at a...
by Prime
Wed Apr 05, 2017 12:09 am
Forum: hardware
Topic: MaxRAM - New Open Hardware BBC RAM/ROM Board
Replies: 68
Views: 1650

Re: New Open Hardware BBC RAM/ROM Board

Well I guess as you're choice of software is so superior to mine, I won't botheroffering to help again.

And yes I'm a little pissed.

Phill.
by Prime
Tue Apr 04, 2017 6:16 pm
Forum: hardware
Topic: MaxRAM - New Open Hardware BBC RAM/ROM Board
Replies: 68
Views: 1650

Re: New Open Hardware BBC RAM/ROM Board

I built a couple of these for myself a little while back pretty useful. Not writable in the beeb but I'm sure that could be added fairly easily. MegaFlashRom+SRAM - MK4.zip Cheers. Phill. Sorry I do not have Eagle, can you post a picture and PDF of the circuit diagram? I could later, but you can do...
by Prime
Tue Apr 04, 2017 2:59 pm
Forum: hardware
Topic: MaxRAM - New Open Hardware BBC RAM/ROM Board
Replies: 68
Views: 1650

Re: New Open Hardware BBC RAM/ROM Board

I built a couple of these for myself a little while back pretty useful.

Not writable in the beeb but I'm sure that could be added fairly easily.

MegaFlashRom+SRAM - MK4.zip
MegaFlashROM+SRAM
(55.12 KiB) Downloaded 29 times


Cheers.

Phill.
by Prime
Mon Apr 03, 2017 1:46 pm
Forum: off-topic
Topic: Shipping boxes.
Replies: 1
Views: 122

Shipping boxes.

Hi all, Anyone know where I can get some boxes suitable for shipping board out, I have some at the moment but they are a little too big : 220 x 160 x 50 (mm), ideally I'd like something that's about 25-30mm thick and around A5 or A6 sided as this makes it easier to just put a lable on the box and ju...
by Prime
Wed Mar 29, 2017 3:58 pm
Forum: hardware
Topic: Announcement : Update on hardware produced by me.
Replies: 5
Views: 331

Re: Announcement : Update on hardware produced by me.

Hi all, Just to say as several of you have either pm'd or updated this thread I have made note of who wants what and will be contacting you in due time to let you know when boards are built / ready to dispatch. One think I do need to point out is that some of these boards will need you to modify you...
by Prime
Tue Mar 28, 2017 12:56 pm
Forum: stardot.org.uk
Topic: https certificates?
Replies: 12
Views: 436

Re: https certificates?

I'd hope that no one used a password on here that they used on anything important (as it's just a forum). HTTPS did cost money but I'll have a look at what you've suggested there, it looks interesting! Self signed certificates would work if web browsers didn't try and scare you into thinking that i...
by Prime
Tue Mar 28, 2017 8:58 am
Forum: other vintage computer hardware, software and games
Topic: Programming Flash roms in situ.
Replies: 1
Views: 88

Programming Flash roms in situ.

Hi all, The DragonMMC board currently uses a AT28C256 EEprom to store the 6809 code, this is good as I have code that allows it to be field upgradable as you can write to it almost like a RAM. The code to reprogram this is working pretty well and has been tested without problems. However the 28C256 ...
by Prime
Mon Mar 27, 2017 8:26 pm
Forum: wanted
Topic: M5 CGL / Sord any cartridge to test a system
Replies: 2
Views: 90

Re: M5 CGL / Sord any cartridge to test a system

Send Sirmorris a message I believe he may be able to help you out......

Cheers.

Phill.
by Prime
Mon Mar 27, 2017 9:57 am
Forum: hardware
Topic: Announcement : Update on hardware produced by me.
Replies: 5
Views: 331

Announcement : Update on hardware produced by me.

Hi all, I thought as I keep getting enquiries I'd better update people. First the "bad" news, It is with regret that I must announce that the mk 5.x Atom Colour board is going to be shelved indefinitely. I cannot get it to work sufficiently well for me to be satisfied with it or have any d...
by Prime
Mon Mar 27, 2017 9:45 am
Forum: other vintage computer hardware, software and games
Topic: IBM PC XT
Replies: 20
Views: 512

Re: IBM PC XT

I've been buying a bit more stuff for this PC and also doing a bit more work on it too. Cleaned out the PSU (was full of 30 odd years of dust). PSU Cleaned.jpg Installed a new fan (after drilling out the old rivets), really quiet now compared to what it was like :D New Fan Installed.jpg I Have a co...
by Prime
Sun Mar 26, 2017 5:43 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 2561
Views: 147612

Re: LOLPRICE

The Atom is harder to find than the ZX80, 100,000 ZX80s were made, how many Atoms? According to STH, over 20,000 units went out of the factory in both kits and pre-assembled form. Article link: https://www.stairwaytohell.com/articles/AU-AcornHistory.html Even at 20,000 machines that's no where near...
by Prime
Mon Mar 20, 2017 9:10 am
Forum: off-topic
Topic: Problems with Verilog bit array.....
Replies: 2
Views: 131

Problems with Verilog bit array.....

Hi all, Posting this here too as I know some of you also use Verilog and may have some useful input, also since the 6809 bus is similar to the 6502 bus that helps too.... I'm making an addon for an old 6809 based computer, one of the components of this machine (Tandy CoCo) has an IC that is programm...

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